The Australian Transport Safety Bureau (ATSB) is Australia's national transport safety investigator. The ATSB's function is to improve safety and public confidence in the aviation, marine and rail modes of transport. The ATSB is Australia's prime agency for the independent investigation of civil aviation, rail and maritime accidents, incidents and safety deficiencies.

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The evidence suggests that Class B AIS transmissions may not be reliably detected by watch keepers on board all ships. Therefore, operators of small vessels fitted with Class B AIS units should be aware that they cannot rely on the AIS unit alone to warn ships of their presence.

Safety advisory noticeThe Australian Transport Safety Bureau advises that all owners, operators and skippers of small vessels should consider the safety implications of this safety issue and take action where considered appropriate.